JP4799557B2 - 多検体センサー - Google Patents
多検体センサー Download PDFInfo
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- JP4799557B2 JP4799557B2 JP2007527617A JP2007527617A JP4799557B2 JP 4799557 B2 JP4799557 B2 JP 4799557B2 JP 2007527617 A JP2007527617 A JP 2007527617A JP 2007527617 A JP2007527617 A JP 2007527617A JP 4799557 B2 JP4799557 B2 JP 4799557B2
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- Prior art keywords
- binding protein
- glucose
- binding
- acid
- protein
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Description
GGBPタンパク質、例えば、23アミノ酸リーダー配列のない(すなわち、成熟した鎖)のGenBank受諾番号No.P02927のGGBPタンパク質などの突然変異の具体例は、これらに限定されないが、11位のリジンに置換したシステイン(K11C)、14位のアスパラギン酸に置換したシステイン(D14C)、19位のバリンに置換したシステイン(V19C)、43位のアスパラギンに置換したシステイン(N43C)、74位のグリシンに置換したシステイン(G74C)、107位のチロシンに置換したシステイン(Y107C)、110位のスレオニンに置換したシステイン(T110C)、112位のセリンに置換したシステイン(S112C)、112位のセリンに置換したシステインおよび238位のロイシンに置換したセリンを含む二重変異体(S112C/L238S)、113位のリジンに置換したシステイン(K113C)、137位のリジンに置換したシステイン(K137C)、149位のグルタミン酸に置換したシステイン(E149C)、149位のグルタミン酸に置換したシステインおよび213位のアラニンに置換したアルギニンを含む二重変異体(E149C/A213R)、149位のグルタミン酸に置換したシステインおよび238位のロイシンに置換したセリンを含む二重変異体(E149C/L238S)、213位のアラニンに置換したセリンおよび152位のヒスチジンに置換したシステインを含む二重変異体(H152C/A213S)、182位のメチオニンに置換したシステイン(M182C)、213位のアラニンに置換したシステイン(A213C)、213位のアラニンに置換したシステインおよび238位のロイシンに置換したシステインを含む二重変異体(A213C/L238C)、216位のメチオニンに置換したシステイン(M216C)、236位のアスパラギン酸に置換したシステイン(D236C)、238位のロイシンに置換したシステイン(L238C)、287位のアスパラギン酸に置換したシステイン(D287C)、292位のアルギニンに置換したシステイン(R292C)、296位のバリンに置換したシステイン(V296C)、149位のグルタミン酸に置換したシステインおよび213位のアラニンに置換したセリンおよび238位のロイシンに置換したセリンを含む三重変異体(E149C/A213A/L238S)、149位のグルタミン酸に置換したシステインおよび213位のアラニンに置換したアルギニンおよび238位のロイシンに置換したセリンを含む三重変異体(E149C/A213R/L238S)、149位のグルタミン酸に置換したシステインおよび213位のアラニンに置換したシステインおよび238位のロイシンに置換したセリンを含む三重変異体(E149C/A213C/L238S)を有するものが含まれる。さらなる実施形態には、Y10C、N15C、Q26C、E93C、H152C、M182C、W183C、L255C、D257C、P294C、およびV296CにおけるGGBPの突然変異が含まれる。
本実施例は、in vitroおよびin vivoでグルコース濃度を連続的にモニターするための装置として、光ファイバー上に結合タンパク質をコーティングしたハイドロゲルの使用を説明するものである。1.5mLのエッペンドルフ(Eppendorf)バイアル中に、8アームPEG−NH2 25.7mgを0.3mL PBSバッファー(pH7.4)に溶かした溶液を、PBSバッファー中のNBD標識したE149C/A231R/L238S GGBPの200μLと混合した(タンパク質濃度は125.5μMで、色素/タンパク質比は0.9である)。NBD標識化したE149C/A231R/L238S GGBPを、本明細書に参照として組み込まれる2002年1月4日出願の特許文献3に記載されているように調製した。次に、PBSバッファー0.5mL中のBTC−PEG−BTC24.5mgを混合物に加えた。完全に混合した後、最終の混合物を、470μmの光ファイバー(Ceram Optec、マサチューセッツ州、East Longmeadow)の末端上に手作業でコーティングし、少なくとも2時間、反応を継続させた。数分以内にゲルが形成し、光ファイバーの先端上に約100から約500μmの厚さの非常に薄いハイドロゲルフィルムが形成した。PEGは親水性ポリマーであるので、ファイバーの先端のシリカのコアの表面上に、ヒドロキシル基で強力な水素結合を形成することができる。
本実施例は、脂肪酸を検出するためのハイドロゲルバイオセンサーの製造を記載するものである。ADIFAB(色素/タンパク質比が約1.0であるアクリロデーテッド腸型脂肪酸結合タンパク質(AcryloDated Intestinal Fatty Acid Binding Protein)、Molecular Probes社)200μgを1.0mLバッファー(Tris50mM、EDTA1mM、アジ化物0.05%、pH8.0)に溶かした溶液を調製した。1.5mLのエッペンドルフバイアル中で、結合タンパク質溶液(210μL)を、8アームPEG−NH2(10000MW、Nektar)21mgと結合させた。8アームPEG−NH2と、結合タンパク質との混合物を、BTC−PEG−BTC(3400MW、Nektar)の180μL PBSバッファー(pH7.4)18mgとさらに混合し、ボルテックスにかけた。2mmのスペーサーで分けた2つのガラスプレート間に、混合物を直ちに注入した。反応が完結した後、形成されたハイドロゲルのシートを、直径5mmのディスクに穿孔し、次いで、ディスクを、PBSバッファー中に2日間浸漬して非結合タンパク質およびモノマーの残留物を洗い流した。ハイドロゲルディスクへの脂肪酸の結合を、Varian Cary Eclipse蛍光光度計および96ウェルのプレートを用いて測定した(励起は390nmであった)。図4は、ハイドロゲルディスクの、広範囲の濃度のアラキドン酸に対する蛍光の応答を表している。ハイドロゲルのセンサーは、蛍光発光波長が432nmから486nmにシフトして、FA(脂肪酸、例えばアラキドン酸)に応答した。FAの濃度の上昇は、486nmにおける発光強度の上昇を引き起こした。
本実施例は、グルコースおよびL−乳酸を同時にモニターするための装置として、光ファイバー上にコーティングした2つの結合性タンパク質を有するハイドロゲルの使用を説明するものである。NBD標識化GGBP誘導体を用いてグルコースをモニターし、選択的な乳酸の結合に対する突然変異を有するアクリロダン標識化GGBP誘導体を用いて、L−乳酸をモニターする。1.5mLのエッペンドルフバイアル中、8アームPEG−NH225.7mgを0.3mL PBSバッファー(pH7.4)に溶かした溶液を、(各々約50〜65μM)の(1)NBD標識化したグルコース特異的なGGBP突然変異E149C/A231R/L238S、および(2)アクリロダン標識化した乳酸特異的なGGBP突然変異Y10K/D14K/N91K/K92L/E149C/H152M/D154H/R158K/W183K/D236A/N256DのPBSバッファー溶液の1:1等モル混合物200μLと混合した。次に、BTC−PEG−BTC24.5mgの0.5mL PBSバッファー溶液を混合物に加えた。混合した後、最終混合物を470μmの光ファイバー(Ceram Optec、マサチューセッツ州、East Longmeadow)の末端上に手作業でコーティングし、少なくとも2時間、反応を継続させた。蛍光光度計を用いてグルコースおよび乳酸の濃度変化を連続してモニターするために、ハイドロゲルのバイオセンサーを用いる。390nmにおける励起し、および約515nmで狭いバンドパスフィルターを通した発光の測定により、L−乳酸の存在および濃度に対応するシグナルがもたらされる。475nmにおける励起、および約550nmでバンドパスフィルターを通した発光の測定により、グルコースの存在および濃度に対応するシグナルがもたらされる。
Claims (18)
- 1つを超える標的検体の濃度を測定するための装置であって、前記装置は、
a)1つを超える蛍光的に標識化された結合タンパク質であって、前記蛍光的に標識化された結合タンパク質はそれぞれ、標識化されていない前記標的検体の1つに特異的かつ可逆的に結合することができる、結合タンパク質、および
b)前記標的検体に対して透過性である、前記1つを超える蛍光的に標識化された結合タンパク質を取り囲む膜
を含み、
前記装置は、前記蛍光的に標識化された結合タンパク質に前記標識化されていない標的検体が結合したときに、蛍光標識から発光した蛍光シグナルのシフトを蛍光検出器に伝達することができ、
異なる検体の数が蛍光的に標識化された結合タンパク質の数に対応することを特徴とする装置。 - 前記装置は、前記蛍光標識から発光した蛍光シグナルのシフトを、検出器に連続的に伝達することができることを特徴とする、請求項1に記載の装置。
- 前記標的検体は、アミノ酸、ペプチド、ポリペプチド、タンパク質、炭水化物、脂質、ヌクレオチド、オリゴヌクレオチド、ポリヌクレオチド、糖タンパク質、プロテオグリカン、リポタンパク、薬物、薬物代謝物、有機小分子、無機分子、ポリマー、およびこれらの組合せからなる群から選択されることを特徴とする、請求項1に記載の装置。
- 前記標的検体の1つは、脂肪酸、乳酸、C反応性タンパク質、およびグルコースからなる群から選択されることを特徴とする、請求項3に記載の装置。
- 前記標的検体は、少なくとも2つの脂肪酸、乳酸、およびグルコースであることを特徴とする、請求項4に記載の装置。
- 前記結合タンパク質は、ガラクトース/グルコース結合タンパク質(GGBP)、マルトース結合タンパク質(MBP)、リボース結合タンパク質(RBP)、アラビノース結合タンパク質(ABP)、ジペプチド結合タンパク質(DPBP)、グルタミン結合タンパク質(QBP)、鉄結合タンパク質(FeBP)、ヒスチジン結合タンパク質(HBP)、リン酸結合タンパク質(PhosBP)、オリゴペプチド結合タンパク質(OppA)、および脂肪酸結合タンパク質(FABP)、およびこれらの誘導体からなる群から選択されることを特徴とする、請求項1に記載の装置。
- 前記結合タンパク質は、GGBP、FABP、およびGGBP誘導体であることを特徴とする、請求項6に記載の装置。
- 前記標的検体は、グルコース、脂肪酸、および乳酸からなる群から選択される少なくとも2つであることを特徴とする、請求項7に記載の装置。
- 前記少なくとも2つの検体はグルコースおよび脂肪酸であることを特徴とする、請求項8に記載の装置。
- 前記少なくとも2つの検体はグルコースおよび乳酸であることを特徴とする、請求項8に記載の装置。
- 前記膜は脂質を含むことを特徴とする、請求項10に記載の装置。
- 前記脂質はグリセロリン脂質であることを特徴とする、請求項11に記載の装置。
- 前記グリセロリン脂質は、ホスファチジルコリン、ホスファチジルエタノールアミン、ホスファチジルセリンからなる群から選択されることを特徴とする、請求項12に記載の装置。
- 前記膜はポリマーを含むことを特徴とする、請求項10に記載の装置。
- 前記ポリマーは、ポリビニルアルコール、ポリアクリルアミド、ポリN−ビニルピロリドン、ポリエチレンオキシド、ポリ加水分解化アクリロニトリル、ポリアクリル酸、ポリメタクリル酸、ポリヒドロキシエチルメタクリレート(polyHEMA)、ポリメチルメタクリレート(polyMMA)、ポリウレタン、ポリエチレンアミン、ポリエチレングリコール、ポリメタクリル酸−ホスホリルコリン(polyMPC)、ポリラウリルメタクリレート(polyLMA)、ヒドロキシエチルメタクリレート−メチルメタクリレートコポリマー(polyHEMA−MMA)、オルトケイ酸テトラメチル、オルトケイ酸テトラエチル、セルロース、酢酸セルロース、カルボキシメチルセルロース、アルギン酸、ペクチン酸、ヒアルロン酸、ヘパリン、ヘパリン硫酸、キトサン、カルボキシメチルキトサン、キチン、コラーゲン、プルラン、ジェラン、キサンタン、カルボキシメチルデキストラン、コンドロイチン硫酸、カチオン化グアー、カチオン化デンプン、ならびにそれらの塩およびエステルからなる群から選択される化合物を含むことを特徴とする、請求項14に記載の装置。
- 代謝性基質レベルの測定をするために対象に埋め込まれた請求項2に記載の装置から、前記基質レベルの測定値を収集することを含むことを特徴とする、対象における代謝性基質レベルをモニターする方法。
- 対象に埋め込まれた請求項2に記載の装置から測定値を収集することを含み、前記標的検体の1つは、脂肪酸、乳酸、およびグルコースからなる群から選択されることを特徴とする、対象における糖尿病をモニターする方法。
- 標的検体の1つがグルコースであることを特徴とする、請求項16に記載の方法。
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JP2008502917A (ja) | 2008-01-31 |
US7951605B2 (en) | 2011-05-31 |
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EP1754059A1 (en) | 2007-02-21 |
US20060078908A1 (en) | 2006-04-13 |
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